Marine boiler.



No. 809,518. PATENTED JAN. 9, 1906.

G. MARSHALL. MARINE BOILER.

APPLICATION FILED SEPT. 11, 1905.

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INVENTOR fiarwlal/ BY HIS mToRm-zys GEORGE MARSHALL, OF FREMONT, NEBRASKA.

MARINE BOILER.

Specification of Letters Patent. Application filed September 11, 1905. Serial N0. 277,978.

Patented Jan. 9, 1906 T0 aZZ whom it may concern.-

Be it known that I, GEORGE MARSHALL, a citizen of the United States, residing at Fremont, in the county of Dodge and State of Nebraska, have invented certain new and useful Improvements in Marine Boilers, of which the following is a specification.

In marine boilers of the type in which the furnace-fines and return-tubes are surrounded by water within the boiler-shell the water below the fires is colder than that above them, and often the presence of this cold-water interferes with obtaining the required temperature to produce steam at the desired pressure.

The object of my invention is to provide means for separating the water below the fires from that above them, so that the presence of the cold water need not affect the water in the upper portion of the boiler.

In carrying out my invention I provide separator bars or partitions which are located between the furnace-flues and the boilershell and between adjacent furnace-flues and which closely fit the shell and flues, preferably by water-tight joints. Preferably each separator bar or partition is composed of cast metal and boiler-steel, the steel enabling me to calk its edges to the boiler shell and flues, while the cast metal gives body and strength to the bars. Many boilers of this class have the furnace-fines corrugated, and in order to accommodate these corrugations and provide a close union between the partitions, shell, and fiues the partitions are correspondingly corrugated.

In the accompanying drawings, Figure 1 shows a front elevation of a marine boiler with parts broken away in order to more clearly show other parts, some of which are in section. The remaining figures are on an enlarged scale. Fig. 2 is a local section showing the manner in which the separator bar or partition of my invention is connected with a furnace-flue. Fig. 3 is a detail view, in section, showing particularly the manner in which the separator-bar is calked to form a water-tight joint with the flue. Fig. 4 is a perspective view of a portion of one of the separator bars or partitions.

In the drawings I have shown a marine boiler comprising two furnaces A B. These furnaces are surrounded by flues C, which extend from the front of the boiler to the rear end thereof, the products of combustion coming back to the front of the boiler through the fire-tubes D. The tubes and flues are inclosed in a shell E. This general type of boiler is of well-known construction and need not be further described.

In the particular boiler shown the furnaceflues C are corrugatedthat is, they are provided with a series of parallel concentric rings formed from the sheet metal of which the flues aremade in the manner illustrated in Fig. 2. In this type of boilers the water fills the-shell E from the bottom thereof below the furnace-flues to a level somewhere above the fiues, and it has been found that the water below the flues, which is necessarily somewhat colder than that above them, interferes with obtaining the proper temperature of the water to produce steam at the desired pressure. I have overcome this difliculty by separating the water in the lower portion of the boiler from that in the upper portion. For this purpose I provide separator bars or partitions F and G. Each of the bars F is preferably made of a cast-metal body f, to which is bolted a plate f, of boiler-steel. Each of these bars may extend the entire length of the furnace-flue, or it may be made in sections. One side of the separator-bar or each section thereof is corrugated, as

shown, to fit the corrugations in the flue O, and it is correspondingly curved to fit the curvature of the shell. It may be held in place in any suitable way. The separator or partition G is similar to F, except that the two opposite sides of the bar or sections thereof are corrugated and curved to correspond with and fit the sides of the flues C. As before stated, the bars may be made in sections. This is indicated in Fig. 4. The part f may be made in a plurality of sections, the joints being overlapped by the plate f This may be made in one piece, or it may be made in sections, but should overlap the joints of the bars f, as indicated in Fig. 4. The separatorbars G are used between adjacent boilers and the bars F between flues and the boiler-shell. Of course if there is only one flue there will be no occasion for using the separator G. By the'use of these bars the Water below the fires is separated from that above them or from the water in the upper portion of the boiler; but in order to insure water-tight joints I preferably calk the plates f to the shell E and the flue C in the manner indicated at ac.

In the drawings I have shown the separator-bars as being located on a level wit the -horizontal furnace flue grate-bars; but the exact location is not essential, it being important only that the water in the lower portion of the boiler, particularly that below the grate-bars, shall be separated from the water above the fires.

I claim as my invention 1. In a marine boiler, the combination of a horizontal furnace flue or casing, a boilershell surrounding it, and partitions fitting the boiler-shell and the furnace flue or casing which separate the water in the lower portion of the boiler from that in the upper portion.

2. In a marine boiler, the combination of a or casing, a boilershell surrounding it, and a partition fitting the boiler-shell, and calked to the furnace flue or casing which separates the water in the lower portion of the boiler from that above it.

3. The combination in a marine boiler of the boiler-shell, the flue and a partition for separating the water in the lower portion of the boiler from that in the upper portion which comprises a body portion and a metal plate secured thereto flue and shell.

4. A marine boiler comprising a shell, and a plurality of horizontal furnace flues or casings, and partitions separating the water in the lower portion of the boiler from that in the upper portion arranged between the furnace flues or casings and the shell and between adjacent flues.

5. The combination with a marine boiler having an inclosing shell and a corrugated furnace-flue, of a partition for separating the water in the lower portion of the boiler from that in the upper portion, comprising a castmetal bar corrugated to conform to the corrugations of the flue and a metal plate attached thereto which is also corrugated and i closely fits the flue and the boiler-shell.

In testimony whereof I have hereunto subscribed my name.

GEORGE MARSHALL.

which is calked to the Witnesses V. J. CoUnrniei-i'r, S. S. SIDNER. 

